Those lines are under the coatings on most of the Busse family knives.

They are only on the "flat" sides of the knife. They are not on the grind areas.

I am pretty sure that Busse (Swamp and Scrapyard) all use the same (apparently) high tech equipment to heat treat and test for hardness.

However, I am sure the treatment process for the different steels (INFI, SR101 & SR77) all very a little.


I have two theories that are based on other information I have read ... or ... I just made up the information and I will claim I created the theory based on information I have read because I can't remember....

Theory 1:

Busse (and kin) have a machine that tests the whole length of the blade for proper hardness. The machine marks the blade in a zig-zag pattern as it is testing for hardness. Maybe the blade is fed through such a machine (??).

Maybe you have seen the hardness test mark on a Puma knife. Puma does a hardness test near the guard area of their knives. The test makes a little divot hole.

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Theory 2:

The marks are from a machine that is part of the Transverse Wave Tempering process. I can't go into any more theory about this as it is top secret.

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The marks a bugger to get out if you are removing the coatings from Busse, Swamp Rat or Scrapyard knives.

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